Ughhh I happened me with those monsters. I had around 80 cards on level 7s, many gold and and after losing a tournament to win around 10p , I did a Roy Keane at the world Cup. In a fit of rage I sold everything for 100 hive. My eye started twitching when I returned and saw the prices.
owch. My heart goes out to all the Roy Keanes : (
Ooooooouch!!! I almost did similar!
I am lucky in that I kept playing a bit so kept my death deck. I fecking regret selling the rest tho, I had all sorts of goodies that are worth a bunch now!